4age 20V Patch Harness for Haltech Stand Alones to OEM engine Harness ECU:Elite 750 Requires no custom modifications to Race Proven Super Graphite Requires no custom modifications to bolt up: Affixes to the OEM intake manifold vibration dampener and base piece with the original fasteners Includes 2 axles worth of Inner We decided to take advantage of the new Elite series ECU and update the kit to provide even more features while keeping the price about the same as the old generation Regarding closed loop O2 control: This kit supports your OEM narrowband O2 sensor but we recommend purchasing this Wideband O2 sensor so you can have full closed loop control at any RPM and throttle input